Solid electrolytic capacitor and manufacturing method therefor

Abstract

A manufacturing method for a solid electrolytic capacitor of the present invention includes producing a terminal frame having aligned therein unit terminal areas each including an anode terminal portion and a cathode terminal portion, placing a rod-like piece on a surface of the terminal frame across a plurality of aligned anode terminal portions, and fixing the rod-like piece to the terminal frame by welding. Thereafter, a solid electrolytic capacitor is provided through a placement of a capacitor element, charge of a mold resin, and a cutting process.

1. A solid electrolytic capacitor comprising a capacitor element including an anode portion and a cathode portion and having an anode lead member projected from the anode portion, an anode terminal electrically connected to the anode lead member, a cathode terminal placed on a reverse surface of the capacitor element and electrically connected to the cathode portion, and a mold resin portion coating the capacitor element, the anode terminal and the cathode terminal, the anode terminal and the cathode terminal being exposed from the mold resin portion,
 wherein a bolster member between the anode lead member and the anode terminal makes an electrical connection between the anode lead member and the anode terminal, the bolster member and the anode terminal being joined to each other by laser welding with a laser beam irradiated from the cathode terminal side, the bolster member being formed so as to have a rectangular cross section, and having both ends thereof extended to both side surfaces of the mold resin portion to expose both end surfaces thereof from both the side surfaces of the mold resin portion. 
 
   
   
     2. A manufacturing method for a solid electrolytic capacitor comprising a capacitor element including an anode portion and a cathode portion and having an anode lead member projected from the anode portion, an anode terminal electrically connected to the anode lead member, a cathode terminal placed on a reverse surface of the capacitor element and electrically connected to the cathode portion, and a mold resin portion coating the capacitor element, the anode terminal and the cathode terminal, the method for manufacturing the solid electrolytic capacitor comprising:
 a terminal frame producing step of producing a metal terminal frame having aligned in one or more lines unit terminal areas each including an anode terminal portion and a cathode terminal portion to serve as an anode terminal and a cathode terminal of one solid electrolytic capacitor; 
 a united frame producing step of placing a metal rod-like piece with a rectangular cross section on a surface of the produced terminal frame along a plurality of aligned anode terminal portions across these anode terminal portions, and fixing the rod-like piece to the terminal frame to thereby produce a united frame; 
 an element complex producing step of placing capacitor elements in the respective unit terminal areas of the produced united frame, and covering these capacitor elements by a mold resin, with an anode lead member of each capacitor element being joined to the rod-like piece of the united frame and with a cathode portion thereof being joined to the cathode terminal portion, to thereby produce an element complex; and 
 a cutting step of cutting the produced element complex for each capacitor element to provide a plurality of solid electrolytic capacitors. 
 
   
   
     3. The manufacturing method for a solid electrolytic capacitor according to  claim 2 , wherein the terminal frame producing step comprises producing a terminal frame having a plurality of unit terminal areas arranged in rows and columns in a matrix form, and the united frame producing step comprises preparing a metal bolster frame having rod-like pieces arranged parallel at row spacings of the unit terminal areas, and laying the bolster frame on a surface of the terminal frame to fix the rod-like pieces to respective surfaces of a plurality of anode terminal portions aligned in columns. 
   
   
     4. The manufacturing method for a solid electrolytic capacitor according to  claim 3 , wherein the united frame producing step comprises fixing the bolster frame to the terminal frame by laser welding. 
   
   
     5. The manufacturing method for a solid electrolytic capacitor according to  claim 4 , wherein the united frame producing step comprises irradiating a laser beam from the cathode terminal portion side to joints of the rod-like pieces and the anode terminal portions when the bolster frame is fixed to the terminal frame by laser welding. 
   
   
     6. The manufacturing method for a solid electrolytic capacitor according to  claim 3 , wherein the bolster frame is provided by providing a plurality of rectangular openings at constant intervals in a metal plate, and the rod-like piece is defined between two adjacent rectangular openings. 
   
   
     7. The manufacturing method for a solid electrolytic capacitor according to  claim 6 , wherein the terminal frame and the bolster frame have formed thereon a positioning portion and a positioning receiving portion to engage each other for positioning both the frames.